Gimenez1x is correct BUT you must place those "gts" commands into the .cfg of the sd.cfg gametype configuration file as well.
To enable friendly fire, the following command works by placing it in the sd.cfg file.
gts friendlyfiretype "1" // 1 for on, 2 for reflect, 3 for shared.Please let me know if you figure out the pre match/round timer settings.